eolbrook



(No Model.) 2 Sheets-Sheet 1.

^ B. HOLBROOK'. BARK CUTTER.

Patented Oct. 19, 1886.

1 @nulqilllgmmn www @MN/AM (No Model.) 2 Sheets-Sheet 2.

BARK CUTTER.

No. 851,178. Patented 001. 19, 1888.

dr/nys Unirse Srarns Artnr ritten,

BYRON HOLBROOK, OF MILVAUKEE, VISCONSIN, ASSIGIIOR OF ONE-HALF TO JACOBORYDERlfIAN, OF SAME PLACE.

BARK-CUTTER.

SPECIEICATION forming part of Letters Patent No. 351,178, dated October19, 1886A Application filed December 5, 1885. Serial No. 181,801. (Noniodcl.)

To @ZZ whom, zit may concern: bear upon said knives, the said screwsserving Be it known that I, BYRON HoLBRooii, of to force thecutting-edges of the knives out Milwaukee, inthe county of Milwaukee,andin (more or less) from the surfaces of the plates 55 the State ofVisconsin, have invented certain H, so as to increase or lessen thedepth of cut 5 new anduseful Improvemenlsin Bark-Cutters, of saidknives. The conical shell G is surand I do hereby declare that thefollowing is rounded by stationary shell K, suitably sea full, clear,and exact description thereof. cured to the base A, and this lattershell has My invention relates to bark-cutters; and it its lower portionconstructed similarly to that 6o consistsin certain peculiaritiesofconstruction, of the former, and secured thereto in the inan- Io aswill be hereinafter claimed, and more fully ner above described areplates L and knives described with reference to the accompanying M, thesaine in construction as those secured drawings, in whichto said shellG. Iy the above-described con- Figure 1 is a sectional view of one formof struction and relative connection ofthe knife- 5 my invention,several of the knives being plates H L with their respective shells G KI5 omitted for the purpose of clear illustration. any one or all of saidplates may be readily re'- Fig. 2 is a horizontal section on line e rc,Fig. moved, should at any time such removal be I; Fig. 3, a top planview, partly in section, found necessary or convenient. of another forniof my cutter; and Fig. 4, a It will be noticed that the knives I of the7o vertical section on line ,i/ y, Fig. 3. shell G are externallyarranged, while those,

2o Arepresents asuitable base,designcd to sup- M, of the shell K arearranged upon its inport my bark-eutter, and te a Stringer, B, atterior, but with their cutting-edges disposed one side beneath thisbase, is pivotally conin opposition to said knives on the former necteda horizontal beam, C, the free end c of shell, a sufficient bark-space,m, being left be- 7: said beam being suitably connected to a vertweenthe respective parts. The shell G has 25 tical adjusting-rod, D,extending up through its upper or solid portion provided with exterthebase and provided with a hand-wheel, b, nal breaker-arms, a, while theshell K is pro- The horizontal beam C is provided with a cenvided at itsinner upper portion with similar tral socket, c, which forms a bearingfor the arms, o. 8o lower end of a vertical shaft, E, said shaft car-Iolted to the base A and shell K so as to 3o rying a series ofbreaker-arms, d, and having leave a barkspaee, p, is a casing, N, andsekeyed theretoabeveled gear-wheel,d, designed cured to anoutwardly-project-ing ilange, q, at to mesh with a similar wheel, e, ona main the upper end ofsaid shell, is the flanged botdriving-shaft, F.Secured to the vertical shaft toni portion, i', of a hopper, O, thelatter hav- 85 E is a conical shell, G, preferably provided ing securedupon its interior breaker-arms s.

55 with a series of slots, f, and a corresponding ln Figs. f3 and 4c,instead of the conical shell series of internal pockets, g, said pocketsbe- G, I employ a cylindrical shell, P, provided ing adapted to receivethe upper offset ends, with slots, and having secured thereto platesl1', of plates H. The lower ends, 7L', of these It and adjustable knivesS, the construction 9o plates are also offset, so as to iit over and andconnection ol'these parts being similar to 4o upon seatsf, formed by thesolid portions of those attached to said shell G. This cylindrithe shellat the lower ends ofthe slots, and at cal shell P has upon its interior,near each this point the parts are bolted together, as end, a series ofspokes or braces, t, radiating shown at t. The several plates are eachprofrom sockets il, adapted to it upon the verti- 9 5 vided withhorizontal slots 7F, through which cal shaft E, so that said cylindermay be re- V45 pass bolts k, having their heads countersunk volvedtherewith. In this form of my barkin external knives, I, thisconstruction and cutter the shelll is surrounded by a cylindriconnectionof the parts permitting of an adcal casing, T, cut out at its upperfront por- `iustnient to vary the cut, as well as to ccintion toregister' with the feeding-trough U. roc pensate for the wear upon saidknives. To This casing is provided upon its interior with 5o furthervary the cut of the knives I, the plates a series of angularprojections, fr, arranged at H are notched at suitable intervals, andprosuitable intervals, and having adjustably sevided withadjusting-screws h, designed to cured thereon knives V, theHitting-edges ol' which are disposed in opposition to those-on thecylindrical shell P, and said casing and shell are so arranged withrelation to each other as to leave between them a bark-space, c.Extending across the trough U, near its Ainner end, is a corrugatedroller, w, one end of which is journaled in a side of said trough, theother end being reduced and extended to revolve in a bearing, w',and'has keyed thereto a band-pulley, 102, and journaled in bearings w3in front of the roller w, on each side of the trough, are shortcorrugated rollers z, said rollers being employed to feed the bark tothe knives upon the revolving cylindrical shellP.

In the operation of the first form of my invention, bark, beingintroduced into the hopper O, is subjected to the action of thebreaker-arms d and s, and by them reduced. The reduced bark is carrieddown between the conical revolving shell G and the stationary one, K,and is further reduced by the action of the breaker-arms n o,projectingfrom the respective shells. After being thus reduced the bark continuesdown and accumulates in the space v m, where it is subjected to theaction of the knives I M on the conical revolving shell G and stationaryshell K, these knives operating to shave the bark, the chips or shavingstherefrom passing through the slots in said shells and falling to thefloor or a suitable receptacle 'below the supporting-frame Aof themachine. The bark-space m may be increased or lessened -accordingly asthe horizontal beam C may be adjusted by the vertical rod D, and thisadjusting means may be alsoemployed to throw the driving mechanism outof gear, it being only necessary to depress said beam a sufficientdistance to bring the gear-wheel d on the shaft E out of mesh' with thegear e on the driving-shaft F.

The operation of that form of my invention shown in Figs. 3 and 4. isvirtually the same as that shown by Figs. 1 and 2 and above described,With the exception that the bark is fed from the trough U by thecorrugated rollers w z directly to the knives upon the revolvingcylindrical shell l?, and the shavings from said bark pass through theslots in said cylindrical shell and fall to the floor or receptacle.Such particles of bark as may escape the action of the revolving knivesare carried on into the space c', between the cylindrical shell l? andcasing T, and as it accumulates to fill said space the mass is actedupon by said revolving knives and the stationary ones, V,upon theinterior of the casing, the cutting-edges of the respective knives beingoppositely arranged, as above described.

By my device the bark is planed into chips or shavings of any desirablegrade, and by the peculiar arrangement of the knives they act on bothsides ofthe mass of bark, thereby facilitating the operation of reducingbark, and the substance thus reduced is left in the best possiblecondition for the extraction of its tanningproperties.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is-

1. In a bark-cutter, the combination of an outer shell, a series ofknives suitably secured to the inner face of said outer shell, an innershell provided with a series of slots that extend in the direction ofits length, a corresponding series of knives suitably secured to theinner shell and having their cutting-edges projected outwardlytherefrom, and means for revolving said inner shell in a directionopposite to the cutting-edges of the knives on the outer shell,substantially as and for the purpose set forth.

2. In a bark-cutter, the combination of an outer shell provided with aseries of slots that extend in the direction of its length, acorresponding series of knives suitablysecured to said shell and theircutting-edges arranged to proj ect inwardly therefrom, an inner shellalso provided with a series of slots similar to those in the outershell, a corresponding series of knives suitably secured to the lattershell and having their cutting edges proj ected outwardly therefrom, andmeans for revolving this inner shell in a direction opposite to thecutting-edges of the knives on the outer shell, substantially as and forthe purpose set forth. v

3. In a bark-cutter, an outer shell provided with a series of slots thatextend in the direction of its length, a corresponding series ofremovable plates secured to said outer shell, and a series of adjustableknives in turn secured to the plates, in combination with an inner shellalso provided with slots similar to those in the outer shell, acorresponding series IOO of plates secured to the inner shell, a seriesof adjustable knives in turn secured to the latter Aplates and arrangedto have their cuttingedges in opposition to those of the knives on saidouter shell, and means for revolving said inner shell, substantially asand for the purpose set forth. g

4. In a bark-cutter, the combination, with means for reducing the bark,of an outer shell, a series of knives secured to said shell and havingtheir cutting-edges arranged to project inwardly therefrom, an innershell provided with a series of knives having their cuttingedgesarranged to project outwardly therefrom, and means for revolving thisinner shell in a direction opposite to the cutting-edges of the kniveson the outer shell, substantially as and for the purpose set forth.

5. In a bark-cutter, an outer shell provided with a series of slots thatextend in the direction of its length, a corresponding series ofexternal pockets, a series of plates offset at their ends and secured tothis outer shell, and a series of knives in turn adjustably secured tothe plates, in combination with an inner shell provided with slotssimilar to those in the outer shell, internal pockets, a series ofplates, also offset at their ends and secured to the inner shell, aseries of knives in turn adjustably-secured to these latter plates andarranged to have their cutting-edges in opposition to those of theknives on said outer casing surroundingsaid outer shell, anda supshell,and means for revolving said inner shell, l porting-base, substantiallyas and for the pursubstantially as and for the purpose set forth. poseset forth.

A bark-cutter comprising a hopper pro- In testimony that I claim theforegoing I vided with interior breaker-arms, a vertcallyhave hereuntoset my hand, at Milwaukee, in adjustable shaft, also provided withbreakerthe county of Milwaukee and State of VVS- arnis, an inner shellsecured to the shaft and cousin, in the presence of two witnesses.provided with exterior knives and breakerl T T arms, au outer shellprovided with interior BX ROA HOLBROOK breaker-arms and knives, thelatter arranged to have their cutting-edges in opposition to those ofthe knives on the said inner shell, a

Vitnesses:

H. G. UNDERWOOD, MAURICE F. FREAR.

